Hubble Galaxy Classification

Galaxy Name x y Type Velocity
(km/s) 		Distance
(Mpc) 		Light Travel Time
(yrs)		 Earth-history Reference
NGC 1381       1630      
NGC 1398       1299      
NGC 224       -59      
NGC 3031       95      
NGC 3384       642      
NGC 4374       854      
NGC 4435       793      
NGC 4486       1180      
NGC 4565       1122      
NGC 4594       963      
NGC 4736       329      
NGC 5055       587      
NGC 5194       565      
NGC 5236       337      
NGC 7331       1105      
3C273       43,700      

  1. The velocity of NGC224 is negative. What does this mean? What are the implications for applying the Hubble Law to this galaxy?

     

     

  2. The type of galaxy 3C273 is impossible to find from these images. Why?

     

     

  3. Look again at the color image of ngc5194. What color are the arms? What color is the bulge? What do these colors tell you about the stellar populations in these regions?